Land Rover cruise control testing
I had this Land Rover in the other day, and I can't find any diagnostic info for the cruise control at all. In fact, the codes I posted are ones that the customer told me it had. When I scanned it, it had several transmission ratio codes, which he is having another shop install his used transmission next week to resolve.
Data stream shows release button normally true. If I press any button, it changes to false. resume shows true when pressed. + shows true when pressed. - stays false all the time, but does change the state of the release button. If I was to guess, I would think that there's a button problem, but I have zero information on this system.
I found wiring diagrams for the cruise, and theory of operation, but zero tests. Does someone at least have the button resistance values, so that I can test it? I told him to see if replacing the transmission will fix it. If it doesn't he will be back.
Sean, out of curiosity what year and model Land Rover?
When you were watching the + and - button input PIDs, were you driving or sitting in a bay?
Both sitting in a bay, and driving. I did find in mitchell, a description for the codes, and P0525 is an internal control module software corruption, maybe just cruise disable, and P0579 is a fault with the buttons, either high resistance, open, short, or stuck.
The course of action for the P0525: Refer to the warranty procedures and policy manual if a module is suspect.
The course of action for the P0579: Refer to the electrical guides, and check the cruise control circuit between the ecm and switch. Check the switch operation, and renew/renew as necessary.
It clearly states to test the switch operation, but no test is listed anywhere in Mitchell, or Identifix.
I'm not sure how he got those codes, because I did not pull them from any computer with my Solus edge, or Autel DS808.